ATP Sony Open: Novak Djokovic strolls past Tommy Robredo in Miami

Novak Djokovic took just 82 minutes to reach the quarter-finals in Miami with a 6-3 7-5 victory over Tommy Robredo.

Last Updated: 26/03/14 5:09am

Novak Djokovic: Bidding for a fourth Miami title

It was a sixth straight win for the Serbian second seed over the Spaniard, as he bids to add to his Miami titles from 2007, 2011 and 2012.

Djokovic surrendered a point to the 16th seed in the third game of the second set after a linesman mistakenly called a Robredo return out, drawing applause from the stands.

Instead of re-playing, the second seed donated the point, giving his opponent an ad.

"In the important moments I played the right shot," said Djokovic. "It was swirly out there and the rain had made conditions heavy and humid.

"I'm glad I got through in straight sets."

Djokovic will now face defending champion Andy Murray in the last eight.

Kei Nishikori also moved into the quarter-finals with a barn-storming 7-6 2-7 7-6 victory over fourth seed David Ferrer in a match lasting three hours and seven minutes.

In a tie of few cheap points, it was the American who out-hit his Spanish rival by 32 winners to 22 to finally gain the upper hand, taking the deciding set 11-9 in the tie-break after saving four match points.

Rampant

Nishikori, ranked 20th this week, also suffered an ankle injury at the start of the third set and fought back from a break down to claim a sensational win.

In the top half of the draw, Nishikori will have the task of facing a rampant Roger Federer in the last eight after the Swiss master swept past Richard Gasquet.

Federer required only 49 minutes as he thrashed the Frenchman 6-1 6-2 to take his place in the quarter-finals.

World number one Rafael Nadal booked his place in the quarter-finals after thumping 14th seed Fabio Fognini.

Nadal, who is bidding for a maiden Sony Open title, dropped just one game against the overmatched Denis Istomin in his last match was equally impressive in a 6-2 6-2 victory over Fognini.

The 27-year-old Spaniard did not lose a single point on serve in the first set, with Fognini pushed to the limit by the top seed's powerful groundstrokes.

Fognini was well below his best and fell 4-0 down before stopping the rot in the fifth game, but the Italian could not impose himself on Nadal's serve and duly lost the first set before being immediately broken at the start of the second set.

Nadal, a runner-up in this tournament on three occasions, was rarely stretched thereafter and duly wrapped up victory inside 62 minutes against an opponent who made 35 unforced errors.

The 13-time grand slam champion will next face 12th seed Milos Raonic in the last eight, with the Canadian ending lucky loser Benjamin Becker's run in the competition with a 6-3 6-4 victory.